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GaSb quantum-well-based “buffer-free” vertical light emitting diode monolithically embedded within a GaAs cavity incorporating interfacial misfit arrays

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9 Author(s)
Mehta, M. ; Center for High Technology Materials, University of New Mexico, Albuquerque, New Mexico 87106 ; Balakrishnan, G. ; Huang, S. ; Khoshakhlagh, A.
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The authors demonstrate a monolithic, electrically injected, vertically emitting GaSb/AlGaSb light emitting diode (LED) emitting at 1.6 μm comprised of a hybrid GaAs/GaSb-based structure. The LED is comprised of a GaSb/AlGaSb quantum well/barrier active region embedded within high index contrast GaAs/AlGaAs distributed Bragg reflectors (DBRs) using two interfacial misfit (IMF) arrays to relieve the strain induced from the high 8% lattice mismatch between the material systems. The first IMF is formed under compressive strain conditions to enable strain-free, defect-free deposition of GaSb active region directly on the lower GaAs/AlAs DBRs without need for thick buffer. The second IMF is formed under tensile conditions to enable the upper GaAs/AlAs DBRs on the GaSb active region. The device demonstrates a maximum output power of 3.5 μW. Initial diode optical and electrical characteristics along with IMF band structure are discussed.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 21 )

Date of Publication:

Nov 2006

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